[PATCH v2 3/7] block: Error an attempt to split an atomic write in bio_split()

From: John Garry
Date: Mon Oct 28 2024 - 11:28:53 EST


This is disallowed.

Signed-off-by: John Garry <john.g.garry@xxxxxxxxxx>
---
block/bio.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/block/bio.c b/block/bio.c
index 42cac7c46e55..ac2b11b164af 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -1749,6 +1749,10 @@ struct bio *bio_split(struct bio *bio, int sectors,
if (WARN_ON_ONCE(bio_op(bio) == REQ_OP_ZONE_APPEND))
return ERR_PTR(-EINVAL);

+ /* atomic writes cannot be split */
+ if (bio->bi_opf & REQ_ATOMIC)
+ return ERR_PTR(-EINVAL);
+
split = bio_alloc_clone(bio->bi_bdev, bio, gfp, bs);
if (!split)
return ERR_PTR(-ENOMEM);
--
2.31.1